<template>
  <div
    ref="floatDrag"
    class="float-position fixed-wrap"
    :style="dragStyle"
    @touchmove.prevent
    @mousemove.prevent
    @mousedown="mouseDown"
    @mouseup="mouseUp"
  >
    <div class="tool-fixed" ref="ball">
      <div class="list log" @click.stop.prevent="goSuccession" v-if="isShow_succession">
        <el-icon :size="20" style="color: #fff">
          <Notebook />
        </el-icon>
        <div>接班</div>
      </div>
      <div class="list log" @click.stop.prevent="goShift" v-if="isShow_handover">
        <el-icon :size="20" style="color: #fff">
          <Edit />
        </el-icon>
        <div>交班</div>
      </div>
      <div class="list log" @click.stop.prevent="showLog" v-if="isShow_log">
        <el-icon :size="20" style="color: #fff">
          <List />
        </el-icon>
        <div>交接日志</div>
      </div>
    </div>
  </div>
</template>

<script>
import useUserStore from "@/store/modules/user";
export default {
  name: "DragBall",
  props: {
    distanceRight: {
      type: Number,
      default: 0,
    },
    distanceBottom: {
      type: Number,
      default: 100,
    },
    isScrollHidden: {
      type: Boolean,
      default: false,
    },
    isCanDraggable: {
      type: Boolean,
      default: true,
    },
    zIndex: {
      type: Number,
      default: 9999,
    },
    value: {
      type: String,
      default: "悬浮球！",
    },
  },

  //data 域
  data() {
    return {
      clientWidth: null,
      clientHeight: null,
      left: 0,
      top: 0,
      timer: null,
      isShow_handover:false,
      isShow_succession:false,
      isShow_log:false,

      currentTop: 0,
      mousedownX: 0,
      mousedownY: 0,
    };
  },
  computed: {
    dragStyle() {
      return {
        left: this.left + "px",
        top: this.top + "px",
        zIndex: this.zIndex,
      };
    },
  },
  created() {
    this.clientWidth = document.documentElement.clientWidth;
    this.clientHeight = document.documentElement.clientHeight;
    console.log(this.clientWidth);
  },
  mounted() {
    this.isCanDraggable &&
      this.$nextTick(() => {
        this.floatDrag = this.$refs.floatDrag;
        if(!this.floatDrag){
          return
        }
        // 获取元素位置属性
        this.floatDragDom = this.floatDrag.getBoundingClientRect();
        // 设置初始位置
        this.left =
          this.clientWidth - this.floatDragDom.width - this.distanceRight;
        this.top =
          this.clientHeight - this.floatDragDom.height - this.distanceBottom;
        this.initDraggable();
      });
    this.isScrollHidden && window.addEventListener("scroll", this.handleScroll);
    window.addEventListener("resize", this.handleResize);
    this.isShow_handover = useUserStore().permissions.includes('index:handover')
    this.isShow_succession = useUserStore().permissions.includes('index:succession')
    this.isShow_log = useUserStore().permissions.includes('index:log')

    // 管理员权限
    if(useUserStore().permissions[0] == '*:*:*'){
      this.isShow_handover = true
      this.isShow_succession = true
      this.isShow_log = true
    }
    console.log(useUserStore().permissions.includes('prod:changeShift:list'));
  },
  methods: {
    showLog() {
      this.$emit("log");
    },
    goShift() {
      this.$emit("shift");
    },
    goSuccession() {
      this.$emit("succession");
    },
    /**
     * 设置滚动监听
     * 设置滚动时隐藏悬浮按钮，停止时显示
     */
    handleScroll() {
      this.timer && clearTimeout(this.timer);
      this.timer = setTimeout(() => {
        this.handleScrollEnd();
      }, 200);
      this.currentTop =
        document.documentElement.scrollTop || document.body.scrollTop;
      if (this.left > this.clientWidth / 2) {
        // 判断元素位置再左侧还是右侧
        this.left = this.clientWidth + this.floatDragDom.width;
      } else {
        this.left = -this.floatDragDom.width;
      }
    },
    /**
     * 滚动结束
     */
    handleScrollEnd() {
      let scrollTop =
        document.documentElement.scrollTop || document.body.scrollTop;
      if (scrollTop === this.currentTop) {
        console.log(this.left);
        if (this.left > this.clientWidth / 2) {
          // 判断元素位置再左侧还是右侧
          this.left = this.clientWidth - this.floatDragDom.width;
        } else {
          this.left = 0;
        }
        clearTimeout(this.timer);
      }
    },
    /**
     * 窗口resize监听
     */
    handleResize() {
      this.clientWidth = document.documentElement.clientWidth;
      this.clientHeight = document.documentElement.clientHeight;
      this.checkDraggablePosition();
    },
    /**
     * 初始化draggable
     */
    initDraggable() {
      this.floatDrag.addEventListener("touchstart", this.toucheStart);
      this.floatDrag.addEventListener("touchmove", (e) => this.touchMove(e));
      this.floatDrag.addEventListener("touchend", this.touchEnd);
    },
    mouseDown(e) {
      const event = e || window.event;
      this.mousedownX = event.screenX;
      this.mousedownY = event.screenY;
      const that = this;
      let floatDragWidth = this.floatDragDom.width / 2;
      let floatDragHeight = this.floatDragDom.height / 2;
      if (event.preventDefault) {
        event.preventDefault();
      }
      this.canClick = false;
      this.floatDrag.style.transition = "none";
      document.onmousemove = function (e) {
        var event = e || window.event;
        that.left = event.clientX - floatDragWidth;
        that.top = event.clientY - floatDragHeight;
        if (that.left < 0) that.left = 0;
        if (that.top < 0) that.top = 0;
        if (that.left >= that.clientWidth - floatDragWidth * 2) {
          that.left = that.clientWidth - floatDragWidth * 2;
        }
        if (that.top >= that.clientHeight - floatDragHeight * 2) {
          that.top = that.clientHeight - floatDragHeight * 2;
        }
      };
    },
    mouseUp(e) {
      const event = e || window.event;
      //判断只是单纯的点击，没有拖拽
      if (
        this.mousedownY == event.screenY &&
        this.mousedownX == event.screenX
      ) {
        this.$emit("handlepaly");
      }
      document.onmousemove = null;
      this.checkDraggablePosition();
      this.floatDrag.style.transition = "all 0.3s";
    },
    toucheStart() {
      this.canClick = false;
      this.floatDrag.style.transition = "none";
    },
    touchMove(e) {
      this.canClick = true;
      if (e.targetTouches.length === 1) {
        // 单指拖动
        let touch = event.targetTouches[0];
        this.left = touch.clientX - this.floatDragDom.width / 2;
        this.top = touch.clientY - this.floatDragDom.height / 2;
      }
    },
    touchEnd() {
      if (!this.canClick) return; // 解决点击事件和touch事件冲突的问题
      this.floatDrag.style.transition = "all 0.3s";
      this.checkDraggablePosition();
    },
    /**
     * 判断元素显示位置
     * 在窗口改变和move end时调用
     */
    checkDraggablePosition() {
      if (this.left + this.floatDragDom.width / 2 >= this.clientWidth / 2) {
        // 判断位置是往左往右滑动
        this.left = this.clientWidth - this.floatDragDom.width;
      } else {
        this.left = 0;
      }
      if (this.top < 0) {
        // 判断是否超出屏幕上沿
        this.top = 0;
      }
      if (this.top + this.floatDragDom.height >= this.clientHeight) {
        // 判断是否超出屏幕下沿
        this.top = this.clientHeight - this.floatDragDom.height;
      }
    },
  },
  beforeUnmount() {
    window.removeEventListener("scroll", this.handleScroll);
    window.removeEventListener("resize", this.handleResize);
  },
};
</script>
<style>
html,
body {
  overflow: hidden;
}
</style>
<style scoped lang="scss">
.float-position {
  position: fixed;
  z-index: 99999;
  top: 70%;
  display: flex;
  align-items: center;
  justify-content: center;
  user-select: none;
}
.cart {
  border-radius: 50%;
  width: 5em;
  height: 5em;
  display: flex;
  align-items: center;
  justify-content: center;
}
.header-notice {
  display: inline-block;
  transition: all 0.3s;
  span {
    vertical-align: initial;
  }
  .notice-badge {
    color: inherit;
    .header-notice-icon {
      font-size: 16px;
      padding: 4px;
    }
  }
}
.drag-ball .drag-content {
  overflow-wrap: break-word;
  font-size: 14px;
  color: #fff;
  letter-spacing: 2px;
}
@import "@/assets/styles/variables.module.scss";
.tool-fixed {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  align-items: center;
  gap: 4px;
  .list {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2px;
    width: 60px;
    height: 60px;
    background: $--color-primary;
    border-radius: 50%;
    box-shadow: 0 2px 12px 0 rgba(52, 133, 91, 0.4);
    cursor: pointer;
    div {
      color: #fff;
      font-size: 12px;
      white-space: nowrap;
    }
  }
  .log {
    margin: 2px 0;
  }
  .ability {
    position: relative;
  }
}
</style>
